﻿//
// FoldersActivity.cs
//
// Author: Jeffrey Stedfast <jeff@xamarin.com>
//
// Copyright (c) 2013-2024 Xamarin Inc. (www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

using System;
using System.Threading.Tasks;
using System.Collections.Generic;

using Android.App;
using Android.OS;
using Android.Views;
using Android.Widget;

using MailKit;

namespace ImapClientDemo
{
	[Activity (Label = "Folders")]
	public class FoldersActivity : Activity
	{
		FoldersAdapter adapter;
		ListView listView;

		protected async override void OnCreate (Bundle bundle)
		{
			base.OnCreate (bundle);

			Console.WriteLine ("FoldersCreated!");

			SetContentView (ImapClientDemo.Android.Resource.Layout.FoldersLayout);

			listView = FindViewById<ListView> (ImapClientDemo.Android.Resource.Id.listView);

			adapter = new FoldersAdapter (this);

			listView.Adapter = adapter;
			listView.ItemClick += (sender, e) => {
				var folder = adapter[e.Position];

				Mail.CurrentFolder = folder;

				StartActivity (typeof (MessageListActivity));
			};

			await Reload ();
		}

		async Task Reload ()
		{
			var personal = Mail.Client.GetFolder (Mail.Client.PersonalNamespaces[0]);
			var folders = new List<IMailFolder> ();

			// Recursively load all folders and subfolders
			await LoadChildFolders (folders, personal);

			adapter.Folders = folders;
			adapter.NotifyDataSetChanged ();
		}

		// Recursive function to load all folders and their subfolders
		async Task LoadChildFolders (List<IMailFolder> folders, IMailFolder folder)
		{
			if (!folder.IsNamespace)
				folders.Add (folder);

			if (folder.Attributes.HasFlag (FolderAttributes.HasNoChildren))
				return;

			var subfolders = await folder.GetSubfoldersAsync ();

			foreach (var sf in subfolders)
				await LoadChildFolders (folders, sf);
		}

		public class FoldersAdapter : BaseAdapter<IMailFolder>
		{
			public FoldersAdapter (Activity parent)
			{
				Parent = parent;
				Folders = new List<IMailFolder> ();
			}

			public List<IMailFolder> Folders { get;set; }
			public Activity Parent { get;set; }

			public override long GetItemId (int position)
			{
				return position;
			}

			public override int Count {
				get { return Folders.Count; }
			}

			public override IMailFolder this [int index] {
				get { return Folders[index]; }
			}

			public override View GetView (int position, View convertView, ViewGroup parent)
			{
				var view = convertView ?? LayoutInflater.FromContext (Parent).Inflate (global::Android.Resource.Layout.SimpleListItem1, parent, false);

				var folder = Folders[position];

				view.FindViewById<TextView> (global::Android.Resource.Id.Text1).Text = folder.FullName;

				return view;
			}
		}
	}
}
